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diff --git a/netwerk/test/unit/test_cookiejars_safebrowsing.js b/netwerk/test/unit/test_cookiejars_safebrowsing.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * Description of the test:
+ *   We show that we can separate the safebrowsing cookie by creating a custom
+ *   OriginAttributes using a unique safebrowsing first-party domain. Setting this
+ *   custom OriginAttributes on the loadInfo of the channel allows us to query the
+ *   first-party domain and therefore separate the safebrowsing cookie in its own
+ *   cookie-jar. For testing safebrowsing update we do >> NOT << emulate a response
+ *   in the body, rather we only set the cookies in the header of the response
+ *   and confirm that cookies are separated in their own cookie-jar.
+ *
+ * 1) We init safebrowsing and simulate an update (cookies are set for localhost)
+ *
+ * 2) We open a channel that should send regular cookies, but not the
+ *    safebrowsing cookie.
+ *
+ * 3) We open a channel with a custom callback, simulating a safebrowsing cookie
+ *    that should send this simulated safebrowsing cookie as well as the
+ *    real safebrowsing cookies. (Confirming that the safebrowsing cookies
+ *    actually get stored in the correct jar).
+ */
+
+"use strict";
+
+const { HttpServer } = ChromeUtils.importESModule(
+  "resource://testing-common/httpd.sys.mjs"
+);
+
+ChromeUtils.defineLazyGetter(this, "URL", function () {
+  return "http://localhost:" + httpserver.identity.primaryPort;
+});
+
+var setCookiePath = "/setcookie";
+var checkCookiePath = "/checkcookie";
+var safebrowsingUpdatePath = "/safebrowsingUpdate";
+var safebrowsingGethashPath = "/safebrowsingGethash";
+var httpserver;
+
+function inChildProcess() {
+  return Services.appinfo.processType != Ci.nsIXULRuntime.PROCESS_TYPE_DEFAULT;
+}
+
+function cookieSetHandler(metadata, response) {
+  var cookieName = metadata.getHeader("set-cookie");
+  response.setStatusLine(metadata.httpVersion, 200, "Ok");
+  response.setHeader("set-Cookie", cookieName + "=1; Path=/", false);
+  response.setHeader("Content-Type", "text/plain");
+  response.bodyOutputStream.write("Ok", "Ok".length);
+}
+
+function cookieCheckHandler(metadata, response) {
+  var cookies = metadata.getHeader("Cookie");
+  response.setStatusLine(metadata.httpVersion, 200, "Ok");
+  response.setHeader("saw-cookies", cookies, false);
+  response.setHeader("Content-Type", "text/plain");
+  response.bodyOutputStream.write("Ok", "Ok".length);
+}
+
+function safebrowsingUpdateHandler(metadata, response) {
+  var cookieName = "sb-update-cookie";
+  response.setStatusLine(metadata.httpVersion, 200, "Ok");
+  response.setHeader("set-Cookie", cookieName + "=1; Path=/", false);
+  response.setHeader("Content-Type", "text/plain");
+  response.bodyOutputStream.write("Ok", "Ok".length);
+}
+
+function safebrowsingGethashHandler(metadata, response) {
+  var cookieName = "sb-gethash-cookie";
+  response.setStatusLine(metadata.httpVersion, 200, "Ok");
+  response.setHeader("set-Cookie", cookieName + "=1; Path=/", false);
+  response.setHeader("Content-Type", "text/plain");
+
+  let msg = "test-phish-simplea:1:32\n" + "a".repeat(32);
+  response.bodyOutputStream.write(msg, msg.length);
+}
+
+function setupChannel(path, originAttributes) {
+  var channel = NetUtil.newChannel({
+    uri: URL + path,
+    loadUsingSystemPrincipal: true,
+  });
+  channel.loadInfo.originAttributes = originAttributes;
+  channel.QueryInterface(Ci.nsIHttpChannel);
+  return channel;
+}
+
+function run_test() {
+  // Set up a profile
+  do_get_profile();
+
+  // Allow all cookies if the pref service is available in this process.
+  if (!inChildProcess()) {
+    Services.prefs.setIntPref("network.cookie.cookieBehavior", 0);
+    Services.prefs.setBoolPref(
+      "network.cookieJarSettings.unblocked_for_testing",
+      true
+    );
+  }
+
+  httpserver = new HttpServer();
+  httpserver.registerPathHandler(setCookiePath, cookieSetHandler);
+  httpserver.registerPathHandler(checkCookiePath, cookieCheckHandler);
+  httpserver.registerPathHandler(
+    safebrowsingUpdatePath,
+    safebrowsingUpdateHandler
+  );
+  httpserver.registerPathHandler(
+    safebrowsingGethashPath,
+    safebrowsingGethashHandler
+  );
+
+  httpserver.start(-1);
+  run_next_test();
+}
+
+// this test does not emulate a response in the body,
+// rather we only set the cookies in the header of response.
+add_test(function test_safebrowsing_update() {
+  var streamUpdater = Cc[
+    "@mozilla.org/url-classifier/streamupdater;1"
+  ].getService(Ci.nsIUrlClassifierStreamUpdater);
+
+  function onSuccess() {
+    run_next_test();
+  }
+  function onUpdateError() {
+    do_throw("ERROR: received onUpdateError!");
+  }
+  function onDownloadError() {
+    do_throw("ERROR: received onDownloadError!");
+  }
+
+  streamUpdater.downloadUpdates(
+    "test-phish-simple,test-malware-simple",
+    "",
+    true,
+    URL + safebrowsingUpdatePath,
+    onSuccess,
+    onUpdateError,
+    onDownloadError
+  );
+});
+
+add_test(function test_safebrowsing_gethash() {
+  var hashCompleter = Cc[
+    "@mozilla.org/url-classifier/hashcompleter;1"
+  ].getService(Ci.nsIUrlClassifierHashCompleter);
+
+  hashCompleter.complete(
+    "aaaa",
+    URL + safebrowsingGethashPath,
+    "test-phish-simple",
+    {
+      completionV2(hash, table, chunkId) {},
+
+      completionFinished(status) {
+        Assert.equal(status, Cr.NS_OK);
+        run_next_test();
+      },
+    }
+  );
+});
+
+add_test(function test_non_safebrowsing_cookie() {
+  var cookieName = "regCookie_id0";
+  var originAttributes = new OriginAttributes(0, false, 0);
+
+  function setNonSafeBrowsingCookie() {
+    var channel = setupChannel(setCookiePath, originAttributes);
+    channel.setRequestHeader("set-cookie", cookieName, false);
+    channel.asyncOpen(new ChannelListener(checkNonSafeBrowsingCookie, null));
+  }
+
+  function checkNonSafeBrowsingCookie() {
+    var channel = setupChannel(checkCookiePath, originAttributes);
+    channel.asyncOpen(
+      new ChannelListener(completeCheckNonSafeBrowsingCookie, null)
+    );
+  }
+
+  function completeCheckNonSafeBrowsingCookie(request, data, context) {
+    // Confirm that only the >> ONE << cookie is sent over the channel.
+    var expectedCookie = cookieName + "=1";
+    request.QueryInterface(Ci.nsIHttpChannel);
+    var cookiesSeen = request.getResponseHeader("saw-cookies");
+    Assert.equal(cookiesSeen, expectedCookie);
+    run_next_test();
+  }
+
+  setNonSafeBrowsingCookie();
+});
+
+add_test(function test_safebrowsing_cookie() {
+  var cookieName = "sbCookie_id4294967294";
+  var originAttributes = new OriginAttributes(0, false, 0);
+  originAttributes.firstPartyDomain =
+    "safebrowsing.86868755-6b82-4842-b301-72671a0db32e.mozilla";
+
+  function setSafeBrowsingCookie() {
+    var channel = setupChannel(setCookiePath, originAttributes);
+    channel.setRequestHeader("set-cookie", cookieName, false);
+    channel.asyncOpen(new ChannelListener(checkSafeBrowsingCookie, null));
+  }
+
+  function checkSafeBrowsingCookie() {
+    var channel = setupChannel(checkCookiePath, originAttributes);
+    channel.asyncOpen(
+      new ChannelListener(completeCheckSafeBrowsingCookie, null)
+    );
+  }
+
+  function completeCheckSafeBrowsingCookie(request, data, context) {
+    // Confirm that all >> THREE << cookies are sent back over the channel:
+    //   a) the safebrowsing cookie set when updating
+    //   b) the safebrowsing cookie set when sending gethash
+    //   c) the regular cookie with custom loadcontext defined in this test.
+    var expectedCookies = "sb-update-cookie=1; ";
+    expectedCookies += "sb-gethash-cookie=1; ";
+    expectedCookies += cookieName + "=1";
+    request.QueryInterface(Ci.nsIHttpChannel);
+    var cookiesSeen = request.getResponseHeader("saw-cookies");
+
+    Assert.equal(cookiesSeen, expectedCookies);
+    httpserver.stop(do_test_finished);
+  }
+
+  setSafeBrowsingCookie();
+});